Draft-controlling device



Aug 21, 1923.

F. T. HOPE DRAFT CONTROLLING nsvxcs Filed Dec., 12 1921 IIIII 2Sheets-Sheet 1 Aug. 21, 1923.

1,465.4 75 F. T. HOPE DRAFT CONTROLLING DEVI CE 2 Sheets-Sheet 2 FiledDec. 12 1921 1 3 III. 1 5 1 FE t -7 ing this specification. 35

Patented Aug. 21,1923. w

UNI ED,- STATES PAIENT OFFlC E- rnxnnarcx 'r. HOPE, or sna'r'rnn,wasnme'rox, assiexon or ens-emu To ram: Ismum, omi-srxrn 'ro enemaa-uaaennn, a m ONE-emu are I. a. cannwmm,

ALL SEAT'BLE, WASHIN GTON.

Y naar'r-coiwnome-"nnvrcn Application filed December 1 The-object'of myinvention is primarily to apply a device to the tops of stacks orchimneys to thereby control the. draft in said'stacks and chimneys andto catch the cinders and sparks and prevent their escape in such way asto cause any danger.' the device has been primarily designed forapplication to the control of escapinggases fromchimneys and stacks, itis evident that it-may be employed for the control of the flow of air-orgases at other places than in chimneys. It is, therefore,- a means forcon-v trollin ventilation as well as gases escaping from c imneys. Myinvention consists of an apparatus which is to be applied to finescarrying air or ases whereb their escape may be contro ed as desire Itconsists of the peculiar constructions and combinations of parts whichwill be hereinafter described and then specifically defined vin theclaims terminatn the accompanying drawings I have shown my inventionembodied in construc tions which differ slightly in details biit in allof which the principles of my invention are embodied. 40 v Figure l is avertical section through the top of a stack having my invention appliedthereto. s

Figure 2 is a similar section showing, however, onl one side of theapparatus and one side of t e stack. 'Figuie 3.is a framentarysectionalview similar to that 0! Figure 2, but showing a slightlydifferent construction. I

igure 4 is a vertical section through the top of the stackand a stillfurther modified type of construction.- n carrying out my invention Iapply to the top of the stacks. water holding tank which surroundsthegtack and in connection While 12, 1921. Serial Io. 521,782..

. therewith I mount a hood which covers the discharge end of the stackandhas its outer edges dependin as a petticoat over the tank so as toforce e gases to pass between the outer riphery of the stack and thelower depen ing edge of the hood, under the latter and then upward-andoutward. The con trol of the area for the escape of the gases 15 securedby varying the level of water contained in t e'tan .If the level ofwater in the tank be raised to the lower edge of the which-coversthestack, the escape of the gaseswill be prevented. If the level of thewaterin the tank be lowered. sufiiciently, the discharge area of thestack beneath the hood is notdecreased'imd there is a free escape assagbfor the gases.

-Referring to igure 1, a stack 1 is shown, this bein illustrated as ofmetal construct'ioni .T e construction of the: stack, whether of 'metal,brick, or concrete, is immaterial.- My inyention may be ap plied tostacks constructed of any type of material and whether round, square, pran other cross sectional shape. The tank, hood; and otherpartsofmyinvention would be modified in construction to conform tothe size andcross sectional shape of the stack. While the device has been shown onlyas applied to metal stacks, it is evident that it may be applied tochimneys of any type of construction. a

A tank 2 is supported about, the upper :end of the stack. As illustratedthis is. shown as earriedby the stack itself through the use of ears orflanges as'20 which cit-i tend over the upper end of the stack. The,manner of supporting this tank is, however, immaterial'and it may besupported independentl of the stack ifthis be found feasible-a'nd isdesired. Itais preferred that the tank be placed close to the stack tofthat there be noappreciable draft between: the tank and the stack.

A hood or dome 3 which may be otconical, rounded, or; any: othersuitable contour, is placed over the stack and referably so as to covera'portion orpossib y all of'the tank 2. Thisis shown as supported bymeans of arms or bars 30 from the -'outer wall of the tank; The mannerof support mag; .howeverybe anything found suitable. Y conjunction withthis onto:- demo .3 is placed as edema-1oz; etti a and slightly into thetank 2. The tank is 7 40 of this inner. dome preferably extends somewhatbelow the top edge of the stack also of such width that a sufficientarea is left between the bottom edge of the inner dome or pettieoatat 40and the outer wall of the tank to furnish ample discharge area for thegases.

It is also desirable attimes that a deflecting cone as 5 be placedinside of the .hood. 7 This as shown in Figures 2 and 3 is in the natureof an inverted cone having its center over the center of the stack. Itacts to deflect the gases outwardly and then into the space between thepetticoat 40 and the stack. In Figure 1 this central deflecting cone hasbeen omitted, the inverted bowlv shaped plate 50 forming an inner liningfor the domes 3 and 4. The air spaces between these plates forminsulation which results in maintaining the inner dome or lining plate'5 at.such a temperature as will prevent collecting a layer of sootthereon. Without; such heat insulatingconstruction a heavy layer of sootmay form thereon which will interfere with the circulation and proper.

working of the device. The tank 2 is supplied with water and" means arealso provided whereby the level of this water may be varied. A pipe6 isconnected with some source of supply of water under sufficient pressureto cause it to' flow upward and discharge into thetank.

This pipe 6 is preferably placed inside ofthe stack, this being donebecause usually itmay be so placed more conveniently than otherwise, itbeing unnecessary to cut any 'holes in the roof of a building to passthe pipe through. Another reason is that a pipe so placed is heatedsufficiently by the gases to prevent freezing of the water in coldweather. The pipe 6 enters the bottom of the tank and ispreferablyterminated by a bend, as 60, which forms a water seal. Thedischarge end of this pipe is also preferably placed below the bottomedge 40 of the deflecting petticoat and not higher than the minimumwater leve which it may be desired to carry in the tank. It may,however, if desired terminateat the bottom of the tank.

At the lower end of'the stack, at such point as to be easily accessible.is placeda valve 61, preferably a three-way valve, so that when desiredwater may be discharged from the pipe 6 through pipe 62 and also level.

the draft, if the cohstruction'of t forms an automatic level controllingfeature.

Wate is drained from the tank while the device i in use through a pipe 7which e;- tcnds upward within the tank and is provided with means sothat the water. surface mav be varied in elevation. It is alsopreferably provided with a return bend, as 70. As contemplated in Figure1 the pipe section 71 is mountedas a sleeve sliding either over orwithin the lower'pipe section 72. It is carried by a lever 73 or in someother suitable manner, which lever is connected with any suitable meanswhereby it may be operated from a lower level such, for instance, aschains or wires 74. By such means the pipe section 71 may be raised orlowered and thereby control the surface level of the water in the tank;f

In Figure 2 the v ipe section 71 is shown as connected with t e mainbody of the pipe 7 through ashort section 75 of flexible hose. The pipesection 71 is suspended upon a leveras 76 pivoted at its outer endW'othe body of the tank and raised and lowered.

through the operation of a 'cord or chain as ,74 which passes overa'pulley as '77. In

Figure 3 the terminal section 71'of the drainage pipe. is mounted uponthe pi e 72 so that it may be swing as upon a inge and its position is-controlled by means of the cords or chains 74, one of which passes overa pulley 8 located towards the bottom of the tank, by means of whichithis pipe section 71 may positively be. pulled downward when it isdesired to .lower the water The other cord extends upwardly and bothpass over pulleys as 77, mounted over the upper edge of the tank.

Gases passing u the stack 1 will be do flected outward an down by theinner hood 4. The level of waterin thetank will be lower than the loweredge 40 of this hood. The gases being. deflected downward, all cindersand sparks carried thereby will be caused to strike the water in thetank and will be caught and held thereby. The gases will passupwardoutside of the hood 4 and be discharged. It is contemplated thatthe dimensions of the hood 4. and the tank 2 will be such as to furnishample discharge capacity. This should at no time be less than the crosssectional area of the stack itself. If, however, it be desired tochoke'the draft this may be" done b raisin water in the tankftherebyecreasin the cross sectional discharge area beneath the hood t. Thisaction may be carried to any the level of extent desired, even to entirestoppa e of evice be designed for such use.

It is preferred that the outer edge of the tank 2 at its top be' locatedslightly below the top'of the stack so that in case there be for anyreason an overflow of water from the tank over its sides, this will notbe disin; a liquid containing tank surrounding the stack just below itsupper dist'harge end, a lmml covering the stack discharge and having itslower edge depending above said tank. said hood being composed of aplu-' 'ralitv of plates connected in spaced-apart relation to form aheat insulating cellular 1 ll l(llll'( and means for controlling the gasdischarge area beneath the lower edge of the hood.

time during cold 2. A draft controller for stacks comprising a liquidcontaining tank surrounding the stack just below its upper discharge endand a hood covering the stack discharge and having its lower edgedepending above said tank, said hood being composed of a plurality ofplates connected in spaced-apart relation to form a heat insulatingcellular structu1'e,'ai1d means for supplying water to and dischargin;it from said tank.

, .3. A draft controller for stacks comprising a water tank 'surroundin;the stack. an

inverted hood covering the stack and ha\ in: g u l n its edges dependinginto the tank. said hood belng composed of separated plates securedtogether to. enclose heat insulatine air layers between them, and watersupply and discharge pipesfor the tank, the latter pipe driving avertically fldPlSttiblG intake.

Signed at Seattle, (ing County. \Vashington, thi s 6th day of December,1921.

i FREDERICK T. HOPE.

